1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
package main
import (
"log"
"os"
"runtime"
. "syscall"
)
func main() {
runtime.LockOSThread()
log.SetFlags(0)
log.SetPrefix("earlyinit: ")
if err := Mount(
"devtmpfs",
"/dev/",
"devtmpfs",
MS_NOSUID|MS_NOEXEC,
"",
); err != nil {
log.Fatalf("cannot mount devtmpfs: %v", err)
}
// The kernel might be unable to set up the console. When that happens,
// printk is called with "Warning: unable to open an initial console."
// and the init runs with no files. The checkfds runtime function
// populates 0-2 by opening /dev/null for them.
//
// This check replaces 1 and 2 with /dev/kmsg to improve the chance
// of output being visible to the user.
if fi, err := os.Stdout.Stat(); err == nil {
if stat, ok := fi.Sys().(*Stat_t); ok {
if stat.Rdev == 0x103 {
var fd int
if fd, err = Open(
"/dev/kmsg",
O_WRONLY|O_CLOEXEC,
0,
); err != nil {
log.Fatalf("cannot open kmsg: %v", err)
}
if err = Dup3(fd, Stdout, 0); err != nil {
log.Fatalf("cannot open stdout: %v", err)
}
if err = Dup3(fd, Stderr, 0); err != nil {
log.Fatalf("cannot open stderr: %v", err)
}
if err = Close(fd); err != nil {
log.Printf("cannot close kmsg: %v", err)
}
}
}
}
}
|
